JP2539325Y2 - Lock brake device for vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a lock brake device for a vehicle, and more particularly to a lock brake device for a vehicle having an alarm.

(Prior Art) Generally, an automobile is provided with a foot brake air brake mechanism for applying a braking force to all the wheels and a parking brake mechanism such as a center brake mechanism configured as a hand brake. For large special-purpose vehicles such as cranes, when performing various operations with the vehicle temporarily stopped on steep slopes at construction sites, etc., the air brake mechanism is activated to directly apply braking force to the wheels to ensure the stability of the vehicle. Is provided in combination with the parking brake mechanism.

In a conventional vehicle having such a lock brake mechanism, since the lock brake state cannot be automatically released when the parking brake is released, there is a problem that the vehicle is started with the lock brake applied.

Therefore, a lock brake device for a vehicle (Japanese Utility Model Application No. 62-48376) which has solved the above-mentioned problem has been filed by the present applicant. When the parking brake is released before the lock brake is released, this vehicle lock brake device sounds an alarm to prevent the driving vehicle from starting without knowing it. If the locked state of the lock brake is released beforehand, most of the drivers will notice the locked state of the parking brake, and the alarm will not be sounded one by one.

(Problems to be Solved by the Invention) By the way, the alarm circuit that drives the relay switch that activates the alarm buzzer includes a stroke switch that is linked to the operation of a manual opening / closing valve that switches between activation and deactivation of the lock brake, a lock switch, A pressure switch for detecting whether or not the pressure of the working pipe is appropriate. In addition, this alarm circuit detects the release operation of the lock brake by the stroke switch and detects the normal pressure by the pressure switch, and then releases the parking brake lever or detects abnormal pressure of the pressure switch. If this is done, an alarm buzzer sounds, and both switches are connected in relation to each other.

For this reason, if the pressure switch fails, the alarm circuit cannot communicate with the power supply side and does not operate at all, and there is a problem in the reliability of the device.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lock brake device for a vehicle which is reduced in size and weight and cost, and has improved reliability.

(Means for Solving the Problems) In order to achieve the above object, a lock brake device for a vehicle of the present invention has a brake tank for storing a working fluid whose pressure has been adjusted, and opens and closes a working fluid pressure from the brake tank. A hydraulic pressure conversion device that receives the hydraulic pressure from the hydraulic pressure conversion device and receives the converted hydraulic pressure from the hydraulic pressure conversion device, and a brake wheel cylinder that operates by receiving the converted hydraulic pressure from the hydraulic pressure conversion device; A control system passage for sending a working fluid pressure signal to the on-off valve, and a lock brake operation manual valve interposed in the control system passage, and the manual valve maintains the open state of the manual valve. And a parking brake sensor for detecting an operating state or a released state of the parking brake, and an operation from the parking brake sensor. A solenoid that can release the lock of the lock mechanism in response to a motion detection signal, a valve stroke switch that can detect an operation state of the manual valve, and a pressure between the manual valve and the on-off valve in the control system passage. And a warning device that sounds when the excitation coil is energized, and is connected to the parking brake sensor, the valve stroke switch, and the pressure sensor, and the stroke switch detects the operation of the manual valve. When you do
When the parking brake sensor detects an operation state of the parking brake and the pressure sensor detects normality of the pressure, the excitation coil is turned off,
When the stroke switch detects the operation of the manual valve, the parking brake sensor detects a release state of the parking brake, and when the pressure sensor detects an abnormality in the pressure, the exciting coil is turned on. Characterized in that the transistor circuit includes a transistor circuit.

(Operation) According to the invention of the present application, when the driver starts after the lock brake is activated, the driver performs a correct lock brake release operation, and at that time, the parking brake sensor detects the activation state of the parking brake, and When the pressure sensor detects a normal pressure, the exciting coil is turned off.

On the other hand, if the vehicle is used improperly, such as releasing only the parking brake for starting, or if the pressure system of the lock brake is defective, the parking brake sensor detects the released state of the parking brake. Alternatively, the pressure sensor detects an abnormality in the pressure, turns on the exciting coil, and sounds the alarm.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an overall configuration diagram of a vehicle lock brake device showing an embodiment of the present invention.

As shown in the figure, the vehicle lock brake device is configured as an air-over-hydraulic vehicle, and includes a compressor (not shown), a brake tank 48 for storing compressed air as working fluid from the compressor, and a An air master 49 as a hydraulic pressure converter that receives the air pressure from the brake tank 48 through an operating system pipe 51 with a double check valve (open / close valve) 46, and the hydraulic pressure converted by the air master 49 from the air pressure through a hydraulic pressure pipe 52 Wheel cylinder 67 for each wheel brake
And a control system pipe 50 for sending an air pressure signal as a working fluid pressure signal from the brake tank 48 to the double check valve 46.
And a 3-way manual valve 39 for lock brake operation inserted in the control system pipe 50, and a parking lever 33 for detecting the operating state or the released state of the parking brake 35.
Parking brake tension sensor (load sensor) 34 as a parking brake sensor for detecting a tensioned state of a wire 36 connected to the wire 36 at a predetermined force or more.
And a park switch 33a as a parking brake sensor for detecting an operating state or a releasing state of the parking lever 33 (an operating command or a releasing command to the parking brake 35). And control system piping 5
A pressure sensor 44 that detects that the air pressure has decreased
And an alarm buzzer 54 as an alarm which operates in response to a pressure reduction signal from the pressure sensor 44.

The double check valve 46 is connected to a brake valve 68 that receives a depression force from a brake pedal (not shown).

The air pressure fed from the brake tank 48 to the air master 49 through the operating system piping 51 is converted into a hydraulic pressure by the air master 49, and this hydraulic pressure is guided to the brake wheel cylinder 67 through the hydraulic pipe 52. ing.

Further, as shown in FIG. 1, the voltage from the battery 30 is supplied to the park switch 33a via the fuse 90, the key switch 31, and the parking brake fuse 32, and the brake lamp 6 shown in FIG.
4. The air lamp 93 is supplied to the manual valve 39 via the fuse 91 and the lock brake dedicated fuse 92, respectively.

As described above, between the fuse 32 and the control box 37, the park switch 33a which closes upon detecting the operation state of the parking brake lever 33 (operation command to the parking brake 35), and the parking switch 35 The parking brake tension sensor 34, which detects a state in which a tension load is applied to the wire 36 (operating state of the parking brake 35) and closes, is connected in series.
When both the operation state of the parking brake 35 and the operation state of the parking brake 35 are detected, a parking brake sensor signal is output to the control box 37 and the control box 37
The preparation display light emitting diode 38 is turned on.

Further, the parking brake tension sensor 34 is
Lock (not shown) of manual valve 39
The solenoid 40 is connected to a solenoid 40 for releasing the mechanism. The solenoid 40 receives the parking brake sensor signal and allows the manual knob 41 to move to the operating position.

The manual valve 39 allows the manual knob 41 to move only when the solenoid 40 is energized when the manual knob 41 is in the inoperative position.

The manual knob 41 takes an operating position when pressed, and when the manual knob 41 is pressed when the solenoid 40 is energized to move the manual knob 41 from the non-operating position to the operating position, the valve
42 is released, the stroke of the manual knob 41 is detected accordingly, the valve stroke switch 43 is closed, and it is determined whether or not the pressure of the pressure sensor 44 is normal. The light emitting diode 45 is lit.

That is, the control system piping 50 between the brake tank 48 and the air master 49 is released via the double check valve 46, the reducing valve 47, and the manual valve 39.

The manual valve 39 is provided at an appropriate location near the driver's seat. The configuration of the manual valve 39 is described in the vehicle lock brake device (Japanese Utility Model Application No. Sho 62-4837) previously filed by the present applicant.
No. 6), the description is omitted here.

With this configuration, the vehicle stops and the park switch 33a interlocked with the parking brake lever 33
Is closed, and when the parking brake tension sensor 34 detects this pulling state, the locked state of the manual valve 39 is released. Thereafter, when the manual knob 41 is pressed for a certain stroke or more, the valve stroke switch 43 is pressed.
Is closed, and the pipe portions 50a and 50b of the control system pipe 50 are brought into communication with each other, and the lock brake is activated.

Then, the hydraulic pressure in each wheel cylinder 67 rises, and the brake lining is expanded to firmly contact the brake lining and the brake drum (not shown) integrally fixed to the wheel (not shown) to fix each wheel.

On the other hand, when releasing the lock brake,
It is only necessary to turn off 41, and if so, the piping section 50a
And 50b are disconnected from each other, and the lock brake is released.

Then, the hydraulic pressure in each wheel cylinder 67 is reduced, and the brake lining is separated from the brake drum (not shown) by a brake lining return spring (not shown) and the lock brake is released.

The air master stroke switch 53 sends a signal to the control box 37 in the event of an erroneous operation when the lock brake is released, an oil leak of the air master 49, and a cylinder failure, and the brake lamp 64 shown in FIG.
Is a switch for turning on.

The alarm buzzer 54a is provided with the air master 49 as described above.
It is designed to sound when an abnormal condition occurs.

The alarm buzzer 54 sounds when the parking brake lever 33 is first operated and returned when the lock brake is released, and when the pressure in the control system pipe 50 decreases.

Next, a control system of the electric circuit in FIG. 2 will be described.

In the figure, the power supply from the battery 30 is a fuse
90, the key switch 31, and the parking brake fuse 33, the parking brake lever 33 is reached, and when the parking brake lever 33 is pulled, the park switch 33
a closes to the top in the figure.

When the park switch 33a is closed, the park switch lamp 56 in the meter panel illuminates that the park switch 33a is closed, that is, the parking brake lever 33 is activated, and the tension load of the wire 36 on the parking brake 35 is reduced. When applied as prescribed, the parking brake tension sensor 34 is closed.

Current turns on the ready display light-emitting diodes 38 of an orange preparation indicator lamp through the terminal A _1, with short-circuited to the terminal A ₉ through the resistor 100, releasing the interlock (not shown) in the manual valve 39 The solenoid 40 to be excited is excited.

When the manual knob 41 of the manual valve 39 is pressed for a predetermined stroke or more after the solenoid 40 is excited, the valve stroke switch 43 closes.

Further, if the pressure in the control system pipe 50 is normal (prescribed pressure), the pressure sensor 44 is closed, and the power from the battery 30 is
Fuse 91, lock brake dedicated fuse 92, input from the terminal A ₂ via a valve stroke switch 43 turns on the green operating display light-emitting diode 45, and displays the state in the locked brake state, the resistor 101 shorted to terminal a ₉ through.

On the other hand, when the valve stroke switch 43 is closed, current flows to terminal A ₃ side, said current, together with the base current of the npn transistor 103 through a resistor 102, the collector current of the npn transistor 103 through a resistor 104 also becomes, to short-circuit from the emitter terminal to terminal a ₉ is the emitter current and.
In this case, since the current does not pass through the capacitor 106, the base current of the other npn transistor 105 is zero, so that the exciting coil 107 is not energized,
The alarm buzzer 54 does not sound while the relay switch 108 remains open.

However, the lock before releasing the brake before the parking brake lever 33 original state, i.e., when the park switch 33a is opened, with ready display light-emitting diode 38 for no current flows from the terminal A ₁ is turned off, The current passing through the terminal A ₃ and the resistor 102 is shifted toward the resistor 100 side where the resistance value is considerably smaller than that of the resistor 102.
Since it flows through 09, the npn transistor 103
Is zero, the current passing through the resistor 104 does not flow to the npn transistor 103 side and the capacitor 106
To the side. Then, the capacitor 106 is charged with a waiting time. This waiting time is provided because it is not necessary to operate the alarm buzzer when the lock brake and the parking brake are released in the wrong order. By the completion of this charging, the base current of the npn transistor 105 increases, and a collector current occurs in the transistor 105, so that the exciting coil 107
Is turned on, the relay switch 108 is turned on, and the alarm buzzer 54 sounds.

Also, the pressure in the control system piping 50 drops and the pressure switch
Similarly, when the 44 is in the open, with actuation indicator light emitting diode 45 for no current flows from the terminal A ₂ is turned off, current passing through the terminal A _3, a resistor 102, diode 110
Flows through the resistor 101 toward
The base current of the pn transistor 103 becomes zero, so that the current passing through the resistor 104 does not flow to the npn transistor 103 side but flows to the capacitor 106 side. Then
The capacitor 106 is charged, the base current of the npn transistor 105 increases, a collector current occurs in the transistor 105, the exciting coil 107 is turned on, the relay switch 108 is turned on, and the alarm buzzer 54 sounds. I will be.

Before releasing the parking brake, the lock brake is released first, that is, the manual knob of the manual valve 39 is released.
41 back to the original state, when the valve stroke switch 43 is open, the operation display light-emitting diode 45 for no current flows from the terminal of the A ₂ is turned off, since no current flows from the terminal of the A ₃ The excitation coil 107 is not energized, the relay switch 108 remains open, and the alarm buzzer 54 does not sound.

As described above, in the present embodiment, the same function as the lock brake device for a vehicle filed by the applicant of the present invention, that is, the alarm buzzer 54 sounds when the parking brake is released before the lock brake is released. And vice versa,
When the lock brake is released before releasing the parking brake, and when the parking brake and the lock brake are activated, the sound should not be emitted,
Since the present invention is realized by a transistor circuit including one relay, the size and weight of the device can be reduced and the cost can be reduced.

Further, the apparatus, even if the pressure switch 44 has failed, the current flows to terminal A ₃ side, when releasing the parking brake before unlocking the brake, since the warning buzzer 54 is sounded, previous Pressure switch 44 as in device
The alarm buzzer 54 does not stop sounding due to the failure of the device, and the reliability of the device can be improved.

As described above, by slightly changing the configuration inside the control box 37 with respect to that of the vehicle lock brake device previously filed by the present applicant, the above two effects, that is, the circuit can be reduced in size at low cost, and The effect that the reliability is improved can be easily exhibited.

Incidentally, reference numerals 111 to 117 in the above-mentioned embodiment indicate rectifying diodes, respectively.

Also, the parking switch of the parking brake lever 33
33a is configured to close upward in the figure when the vehicle is stopped, and to close downward when driving.

The operation state of the alarm buzzer sounds when the lock brake is released, the air master 49 is closed irrespective of the lock brake, and the air master stroke switch 53 is closed at the time of oil leakage of the air master 49 and a cylinder failure. The alarm is sounded at the alarm buzzer 54a even when it is closed to the lower side, and at the same time as its sounding, the brake lamp in the instrument panel
64 lights up to warn the driver of the abnormal condition.

Also, when the pressure of the control system pipe 50 is abnormal (pressure drop), the low air pressure switch 66 is closed, and the alarm buzzer 54a sounds even during traveling irrespective of the lock brake, similarly to the above. The air lamp 93 in the instrument panel is turned on at the same time as the sound is blown to warn the driver of the abnormal condition.

It should be noted that the present invention is not limited to the above embodiment, and various changes can be made without departing from the gist of the present invention.
For example, air whose pressure has been reduced may be used as the working fluid. In this case, a vacuum pump is used instead of the compressor. Further, a liquid such as oil may be used as the working fluid. In this case, the air system of the lock brake mechanism in the embodiment is entirely configured as a hydraulic system.

(Effects of the Invention) As described above, according to the lock brake device for a vehicle of the present invention, in particular, a transistor circuit connected to a parking brake sensor, a valve stroke switch, and a pressure sensor is provided. When the parking brake sensor detects the operation state of the parking brake and the pressure sensor detects normal pressure when detecting the operation of the manual valve, the excitation coil is de-energized, and the stroke switch activates the manual valve. When it is detected, the exciting coil is turned on when the parking brake sensor detects the release state of the parking brake and when the pressure sensor detects an abnormal pressure.

As described above, when the operation of the manual valve is detected by the stroke switch, if the operation state of the parking brake and the pressure sensor detect normal pressure, the excitation coil is de-energized, while the parking brake is released. Or, when the pressure sensor detects an abnormal pressure, the exciting coil is energized and the alarm sounds.

For this reason, when starting after the driver has activated the lock brake, the driver forgets to release the lock brake,
If the vehicle is used improperly, such as releasing the parking brake and entering the vehicle, or if the lock brake pressure system is defective, the parking brake sensor detects the released state of the parking brake or the pressure sensor detects an abnormal pressure. Is detected and the exciting coil is turned on.
By sounding the alarm, the driver can be informed of incorrect usage or a defect in the pressure system of the lock brake, thereby further improving the reliability of the device.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a vehicle lock brake device showing one embodiment of the present invention, and FIG. 2 is an electric circuit diagram of the same device. 33… parking brake lever, 33a… park switch, 34… parking brake tension sensor, 35
…… Parking brake, 39… Manual valve for lock brake operation, 40 …… Solenoid, 41 …… Manual knob, 43…
… Valve stroke switch, 44 …… Pressure switch, 46
…… Double check valve (open / close valve), 48 …… Brake tank, 49 …… Hydraulic pressure converter, 50… Control system piping, 51 ……
Operating system piping, 54 alarm buzzer, 67 wheel cylinder for brake, 103, 105 transistor, 107 excitation coil, 108 relay switch.

Claims (1)

(57) [Scope of request for utility model registration] 1. A vehicle, comprising: a brake tank for storing a working fluid whose pressure has been adjusted; and a fluid for receiving a working fluid pressure from the brake tank through an operating system passage with an on-off valve to convert the working fluid pressure into a brake fluid pressure. A pressure conversion device, a brake wheel cylinder that operates in response to the converted hydraulic pressure from the hydraulic pressure conversion device, a control system passage that sends a working fluid pressure signal from the brake tank to the on-off valve, A lock brake operation manual valve interposed in the system passage, and a lock mechanism capable of maintaining the release state of the manual valve is provided on the manual valve to detect a parking brake operation state or a release state. A parking brake sensor, and a solenoid capable of receiving an operation detection signal from the parking brake sensor and unlocking the lock mechanism. A valve stroke switch that can detect an operation state of the manual valve, a pressure sensor that detects a pressure between the manual valve and the on-off valve in the control system passage, and an alarm that sounds when an exciting coil is energized The parking brake sensor is connected to the valve stroke switch and the pressure sensor, and when the stroke switch detects the operation of the manual valve, the parking brake sensor detects an operation state of the parking brake. When the pressure sensor detects that the pressure is normal, the exciting coil is de-energized, and when the stroke switch detects the operation of the manual valve, the parking brake sensor changes the release state of the parking brake. And the pressure sensor detects the pressure abnormality. If, vehicle locking braking device, characterized in that it comprises a transistor circuit that energized the exciting coil.